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- [S0008] Alle Friezen, (www.allefriezen.nl), Geboorteregister 1887, archiefnummer 30-05, Burgerlijke Stand Barradeel - Tresoar, inventarisnummer 1039, aktenummer 0158 Gemeente: Barradeel Periode: 1887.
- [S0008] Alle Friezen, (www.allefriezen.nl), Militieregisters, archiefnummer 11, Provinciaal bestuur van Friesland 1813-1922 - Tresoar, inventarisnummer 9590, aktenummer 067285 Periode: 1907.
- [S0047] Familysearch, (www.familysearch.org), "New York Passenger Arrival Lists (Ellis Island), 1892-1924", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:J6D4-JTR : 21 August 2019), Beert De Vries, 1920.
- [S0047] Familysearch, (www.familysearch.org), "Illinois, Northern District (Eastern Division), Naturalization Index, 1926-1979," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2H5V-D3K : 8 November 2017), Bert De Vries, 1939; citing Naturalization, Chicago, Cook, Illinois, United States, National Archives and Records Administration, Great Lakes Region, Chicago.
- [S0047] Familysearch, (www.familysearch.org), "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1CN-3WT : 21 August 2020), Bert Devries, Feb 1984; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
- [S0008] Alle Friezen, (www.allefriezen.nl), Huwelijksregister 1913, archiefnummer 30-12, Burgerlijke Stand Franeker - Tresoar, inventarisnummer 2041, aktenummer 0018 Gemeente: Franeker Periode: 1913.
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